When we talk about open-source, we know the support is global. Chances can be both, chances can be positive and negative. Looking to the origin of react native, Facebook itself uses react-native for its Facebook app and Facebook is constantly growing, adding other brands in its plate so thinking that Facebook will stop releasing updates to react native is currently too early to think negative.
69.4% of the developer community supported react native in 2018, and it is currently too trending for the cross-platform app development.
The future is bright and can go for react native without worrying.